Materials engineering topic list of research papers
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Reduction in length of transient region in successive forging of tailored blank for hot stamping of ultra-high strength steel parts
Abstract Tailored blanks having a thickness distribution without welds were produced by successive forging, and the length of the transient region in which the thickness gradually decreases was reduced by an infinitesimal feed. The effect of the...
2017 / Yuki Nakagawa, Ken-ichiro Mori, Yoshimitsu Murata, Tomoyoshi Maeno -
Numerical and experimental investigation of dry deep drawing of aluminum alloys with conventional and coated tool surfaces
Abstract The demand for light weight concepts in the automotive industry motivates a permanently increasing amount of aluminum alloys in the body in white. Aluminum alloys cause challenging tribological conditions in sheet metal forming due to their ...
2017 / Jennifer Tenner, Kolja Andreas, Adrian Radius, Marion Merklein -
As-built surface layer characterization and fatigue behavior of DMLS Ti6Al4V
Abstract Direct Metal Laser Sintering (DMLS) is a powder bed fusion technology used in the fabrication layer-by-layer of metallic parts directly from a CAD file. Since the fatigue behavior of DMLS Ti6Al4V is strongly influenced by the surface...
2017 / R. Konečná, G. Nicoletto, S. Fintová, M. Frkáň -
Dynamic Calculation of Nonlinear Oscillations of Flat Trusses Part 2: Examples of Calculations
Abstract In the second part of the article the application of the mathematical model of nonlinear oscillations given in the 1st part of the article, to the problems of the dynamics of trusses and truss structures as discrete dissipative systems in...
2017 / Evgeny Ufimtcev -
Identification of Ductile Fracture Parameter with Stress Correction Method Using Notched Round-Bar Tensile Test
Abstract A stress correction method is proposed for the identification of flow stress with the circumference notched round bar tensile test. Flow stress is evaluated post necking until final fracture in the tensile test. Tensile load and change in...
2017 / Masanobu Murata, Yoshinori Yoshida, Takeshi Nishiwaki -
Optimizing Design of Two-dimensional Forging Preform by Bi-directional Evolutionary Structural Optimization Method
Abstract Preform is a step between blanking and finish forming. Design and optimization of the preform for forging would affect the material flow, forming load, dimension accuracy and tool wear. In this study, analysis, simulation and optimization...
2017 / N.V. Ngo, Q.C. Hsu, W.H. Li, P.J. Huang -
Experimental investigation of tensile properties and anisotropy of 1420, 8090 and 2060 Al-Li alloys sheet undergoing different strain rates and fibre orientation: a comparative study
Abstract Al-Li alloys have gained great attention for military, aerospace, and commercial applications because of their outstanding properties compared to commercial Al alloys. However, the tensile properties of former Al-Li alloys cannot fulfil...
2017 / Ali Abd El-Aty, Yong Xu, Shihong Zhang, Yan Ma, Dayong Chen -
Trimming and Sheared Edge Stretchability of Light Weight Sheet Metal Blanks
Abstract In recent years, implementation of aluminum alloys, advanced high strength steels (AHSS) and ultra high strength steels (UHSS) is quickly increasing in automotive components due to their superior structural performance and vehicle weight...
2017 / Sergey Golovashchenko, Weitian Zhou, Saeid Nasheralahkami, Nan Wang -
Influence of natural defects on the fatigue limit of a cast Al-Si alloy
Abstract Experimental high cycle fatigue tests have been performed in order to define the impact of casting shrinkages on the fatigue limit of the A357-T6 cast Aluminum alloy. Both cavity and sponge shrinkages have been analyzed. The effect of the...
2017 / A. Rotella, Y. Nadot, M. Piellard, R. Augustin -
Improvement in mechanical properties of semi-solid AA7075 aluminum alloys by Equal-Channel Angular Pressing
Abstract To improve the formability of high strength aluminum alloys (extra super duralumin 7075), the authors focused on two methods, semi-solid casting and Equal-Channel Angular Pressing processing. This research reports observations of effect of...
2017 / Go Horikiri, Tsubasa Kitazumi, Keiko Natori, Tatsuya Tanaka -
Thread rolling and performance evaluations of a new anti-loosening double thread bolt combining a single thread and multiple threads
Abstract We have devised new bolt fasteners based on an innovative double thread mechanism composed of a coarse single thread and coarse multiple threads (called DTB-II). In order to improve the rolling formability and the strength, the screw-thread ...
2017 / Toshinaka Shinbutsu, Shuichi Amano, Teruie Takemasu, Toshihiko Kuwabara, Jyo Shimura -
The flow stress evolution and grain refinement mechanisms during hot deformation of Al-Mg alloy
Abstract In this study, the hot deformation behavior of an Al-1% Mg alloy with very coarse initial grain size was investigated in terms of flow stress evolution and grain refinement mechanism. The large grain size was employed to study the...
2017 / Ke Huang, Roland E. Logé -
Investigation of a novel modified die design for fine-blanking process to reduce the die-roll size
Abstract Fine-blanking is known as an effective sheet metal forming process to obtain precisely blanked parts with smooth cutting surface. However, the die-roll occurred in the sharp area is an inevitable problem which decreases the working...
2017 / Bo Tang, Yanxiong Liu, Huajie Mao -
Constitutive modelling of a T74 multi-step creep ageing behaviour of AA7050 and its application to stress relaxation ageing in age formed aluminium components
Abstract This work focuses on validating a model, which is defined using load controlled creep ageing data, from strain-controlled stress relaxation ageing tests. A set of phenomenological constitutive equations were proposed. The material constants ...
2017 / Jing-Hua Zheng, Catrin M. Davies, Jianguo Lin, Ran Pan, Chen Li -
Defect Analysis and Fatigue Design Basis for Ni-based Superalloy 718 manufactured by Additive Manufacturing
Abstract It is well known that high strength metallic materials with Vickers hardness HV>400 are very sensitive to small defects. This paper discusses fatigue properties of a Ni-based Superalloy 718 with HV=~470 which was manufactured by additive ...
2017 / Yoichi Yamashita, Takao Murakami, Rei Mihara, Masami Okada, Yukitaka Murakami -
Prediction of Geotechnical Parameters Using Machine Learning Techniques
Abstract In the present study, relationships between in-place density using SPT N-value, compression index (Cc) using liquid limit (LL) and void ratio (e), and cohesion (c) and angle of internal friction (ϕ) using SPT N-value have been established...
2018 / Nitish Puri, Harsh Deep Prasad, Ashwani Jain -
Galling mechanism in metal forming process with TRD coated die against advanced high strength steel sheet
Abstract Galling behavior in sheet metal forming of advanced high strength steel (AHSS) is of great concern in automobile industry. To examine the galling mechanism in sheet metal forming, Finite element analysis and U-bending test with VC coating...
2017 / Wenzheng Dong, Ling Xu, Junjie Wen, Qiquan Lin, Zhigang Wang -
Evaluation on Tensile and Fatigue Crack Growth Performances of Ti6Al4V Alloy Produced by Selective Laser Melting
Abstract Additive manufacturing (AM) technologies are increasing in importance for aerospace application, where the demand for a fundamental understanding and predictability of static and dynamic material properties are high. As the most widely used ...
2017 / Z.H. Jiao, R.D. Xu, H.C. Yu, X.R. Wu -
Accurate prediction of large radius air bending using regression
Abstract The industrial importance of air bending applications with high strength steels has increased in recent years. However, the limited bendability of high strength steels leads to the necessity of using large radius punches. The usage of such...
2017 / Vitalii Vorkov, Richard Aerens, Dirk Vandepitte, Joost R. Duflou -
Thermal Protection of Internal Combustion Engines Pistons
Abstract The research aiming to improve the reliability and durability of internal combustion engines (ICE) has traditionally been relevant. Today, the use of ceramic materials and coatings in engine manufacturing is an increasingly frequent...
2017 / N.Yu. Dudareva, R.D. Enikeev, V.Yu. Ivanov